γ parameter arising from Anomalous diffusion stretched-exponential
method has been used to investigate tissues, showing the ability of γ
maps to discriminate between different brain structures on the basis of their
microstructural complexity. Here, we measure γ in controlled phantoms
comprised of monodispersed and polydispersed micro beads in water solution to
tested the influence of the internal gradient (due to the magnetic
susceptibility difference between diffusing water and obstacles) with respect
to the capability of γ to discriminate between structures characterized
by different geometrical dimensions. Experimental data showed that the higher
the internal gradient, the lower the γ value.